TAKE THE MANUFACTURER AND MODEL NUMBER FROM THE UNIT.THEN TAKE THAT INFORMATION AND THE FUSE TO YOUR LOCAL APPLIANCE PARTS STORE.THEY CAN
MATCH IT UP FOR YOU.YOU CAN ALSO USE THE INTERNET TO DO IT YOURSELF.JUST TYPE IN THE NAME AND MODEL # OF THE UNIT.

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Most Frequent Causes for Microwave not working Thermal Fuse

The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset-if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse The thermal fuse cuts off power to the microwave if the microwave overheats. To determine if the thermal fuse has blown, use a multimeter to test it for continuity. If the fuse does not have continuity, replace it. The thermal fuse cannot be reset-if the fuse is blown, it must be replaced. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the thermal fuse

Most microwaves have an internal fuse; it might be blown. To access it, you'd have to take the oven apart (usually just a few screws), BUT capacitors inside could store hundreds of volts, even after the unit has been unplugged for a while, so do not attempt to replace it unless you are familiar with HV circuits.
Other possibilities are a burnt-out magnetron or tranformer; it would be cheaper to buy a new oven than to replace those components.

The description you provide indicates the magnetron has failed, "heats food" and blown the main fuse in the microwave oven, since the unit is 10 years old it is much cheaper to replace with a new one rather than have it repaired.

Might have to look for the series fuse to the magnetron, if blown and on replaccement if this blows again the magnetron is faulty and needs a replacement.
If this seems OK , the high voltage capacitor can be weak or open or short. replace and the microwave will work.
Finally check the door switch the temperatrue cut off unit , the main relay and the control board.

Its tripping a high limit most likely. Be careful there is 2100 to 4000 volt high side with a capacitor if its not an inverter. The standard components consist of noise board, fuse, touch panel and power controller, high limits, door switches, whipper motor, fan, transformer, capacitor, transformer, magnetron, diode, plate rotator.
Discharge cap (for safety and further testing)..
Test fuse; if fuse tests blown test door switches first.
Test limits.
Check amp draw with slow blow fuse; open door to stop unit and again discharge capacitor.
Test resistance to ground on whipper, fan, magnetron, light.
Test resistance lead to lead (measurable on motors/coils/magnetron).
Test capacitor in ferrads, compare to spec on print.
Check diode forward and reverse.
Test output voltage from power control board to transformer.
Test transformer coils.
Best of luck and play safe; dont test voltage output from the transformer, voltage at capacitor or magnetron.

1. Internal fuse has blown2. Capacitor within the microwave has blown3. Magnatron coil has gone open circuit.

If it was a *really* big pop, then it's most likely to be the capacitor.

Do not open the machine unless you feel confident enough to discharge the main capacitor and ground it to the chassis before performing any work as it will hold a charge for a considerable time even after the device is turned off at the mains.

If the internal fuse has blown, then this can be replaced however it may indicate another problem with the HT power supply side of the circuit.

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

I'm assuming that it doesn't microwave either. If it does...then the heater is bad. Sears parts sells them. Second guess is a blown fuse or thermosensor. Inside the pad housing, locate the internal fuse and replace it if blown. The thermosensor is a black plastic bit about the diameter of a dime and 3/8 inch thick and clamped to the side of the unit inside the control area. Test it for continuity and replace if open. If not either of these, then you have power supply issues or control panel problems. My bet: the heater blew out. Often, this is caused when you heat greasy foods.